1. Basic Definition
Elastic seat gate valve (also known as elastic seat seal gate valve or soft seal gate valve) is a valve that achieves cut-off control through elastic sealing elements. Its core feature is that the gate is covered with elastic material (such as rubber) as a whole, and the deviation of the sealing surface is compensated by slight deformation, solving the problems of traditional gate valves such as easy leakage and corrosion. It is widely used in pipeline systems such as water supply, drainage, fire protection, and chemical industry, especially suitable for working conditions containing impurities or frequent opening and closing.
2. Core structure
Elastic gate and sealing components
The surface of the gate is covered with corrosion-resistant rubber as a whole, combined with European vulcanization technology to ensure that the material fits tightly with the metal skeleton to form elastic deformation compensation capabilities.
The valve seat adopts a flat-bottomed full-flow straight-through design, which cooperates with the elastic gate to form a double seal, reduce fluid resistance and prevent impurity accumulation.
Drive and transmission mechanism
The valve stem cooperates with the top nut through the trapezoidal thread to convert the rotational motion into vertical lifting motion to realize the opening and closing of the gate.
Optional manual (handwheel, operating lever), electric or pneumatic drive modes can be selected to meet the needs of different scenarios.
Anti-corrosion and hygienic design
The inner and outer surfaces of the valve body are sprayed with epoxy resin or lined with enamel, and the valve stem is made of stainless steel/bronze, which is corrosion-resistant and meets the drinking water hygiene standards.
3. Working principle
Sealing mechanism: When closed, the valve stem thrust causes the elastic gate to deform slightly and fit the valve seat tightly. At the same time, the sealing pressure ratio is enhanced with the assistance of the medium pressure, forming a rigid + elastic double sealing effect.
Opening and closing characteristics: When fully open, the gate rises to the top of the valve cavity, and the flow channel is completely unobstructed (the opening is 1.1 times the pipeline diameter). After closing, it is reversed by 1/2-1 turn to avoid jamming caused by thermal expansion and contraction.
4. Performance advantages
Lightweight: The resin sand molded ductile iron valve body is used, which is 20%-30% lighter than the traditional gate valve and is easy to install and maintain.
High sealing: The three "O" ring design, combined with elastic compensation ability, significantly reduces the risk of leakage.
Corrosion resistance: Epoxy coating and rubber coating technology extend the service life and are suitable for corrosive media such as sewage and chemicals.
Low flow resistance: Flat-bottomed straight-through flow channel design reduces pressure loss and is suitable for large flow scenarios.
5. Application scenarios
Municipal engineering: Pipeline regulation and cut-off control of water plants and sewage treatment systems.
Industrial field: Pipelines containing particles or viscous media in industries such as petroleum, chemical, and metallurgy.
Fire protection system: Rapid opening and closing and zoning control in fire protection water supply networks.
6. Selection and operation and maintenance points
Specification requirements: The nominal pressure must be ≥ the working pressure of the pipeline, and the closed state must withstand 1.1 times the working pressure without leakage.
Installation specifications: Horizontally installed on the pipeline, the valve stem must maintain verticality to avoid jamming; anti-corrosion valve wells must be configured when buried.
Maintenance suggestions: Regularly check the wear of the gate rubber, clean the impurities in the valve cavity, and lubricate the exposed valve stem part.
The elastic seat gate valve has become the preferred valve with both reliability and economy in the field of modern fluid control through the coordinated design of elastic sealing and structural optimization.